Have a section of pages wher there are not enough adwords to serve, so get charity ads about 80% of the time. Have emailed google to see if they can improve it for me. Other issue here is that the page name is not changing on your site so "mediabot" will not revisit. One of the intial visits have set the ads for you. Changing the page name will get the "bot" out to have a look. When adding adsense to new pages seems to get it out to index quickly. Just some thoughts on this.

I have pages that change regularly, without any problems. Could the news content of the past couple days be such that there wouldn't be any targeted ads to show? When was the last time the AdSense Mediabot stopped by those two pages? Perhaps the issue could be the content on one particular day when the bot indexed it, but it hasn't been back again since - I am not sure how often the bot stops by for re-indexing a URL that they have already visited. Visi mentioned changing the page name, which I didn't know about, but then I know some don't want to be changing page titles often due to search engine optimization.

Another thing to keep in mind is that many advertisers turn off their campaigns over the weekend, which could also reduce the number of available ads to show. What were these pages showing in previous weekends?

agree with danny. Im just guessing, but we do base our page design on it, that there is a certain amount of content, perhaps decribing the theme or content of any possible news items that will appear there, that will make sure Adsense ads are on target to that "permanant content" anyway, even though the details of the news headlines may vary. This "permanent content" may contain links and bolds and the like and Headings, and a keyword in the file name, but it should always correctly summarise the theme of the page even though the headlines delivered from day to day vary a lot within that theme.

Agree Danny, if you put the code on the general page which keeps the headlines etc then AdSense will probably have difficulty keeping up with the changes. Why not just put the code on each articles page and leave it off the main headline pages.

IMHO PSA ads only come up when there isn't any discernable key content on the page.

Not in my experience.

We have a few pages with a paragraph or two and a link to a great search engine submission/ranking program. The ads on those pages are for 3 SEOs and a portal search.

But even if it was completely static, isn't a news round-up page likely to cover too broad a range of topics to allow a page theme/topic to be deduced?

Our news and archive pages (mentioned in my first post) are Drudge-style headlines linked to news stories. They are pretty focused, and sectioned off in categories such as "Bioterrorism News," "Israeli / Palestinian Headlines," etc.

Further, one the third day, after a page has moved through the news.html page and the archives.html page and into a permanent place, we get ads for "Terrorist Alert System," "Iraq Reconstruction News," and a conservative book service. The page has the exact same layout throughout the migration process.